Well-drilling device



W. L. CHURCH.

WELL DRILLING DEVICE. APPLICATION FILED JUNE 3|19|9- 1,33;?36D PatentedFeb. 10,1920.

BY wwells.

' WALTER LEE cannon,

F HUMBLE, TEXAS.

WELL-DRILLING DEVICE.

Specification of Letters Patent.

Patented Feb. 10, 1920.

Application filed'ilune s, 1919. Serial No. 301,507..

ITO all whom it may concern:

Be it known that I, WALTER LEE Cannon, a citizen of the United States,residing at Humble, 1n the county-of Harris and State 6 of Texas, haveinvented certain new and usel0- percussion type, adapted to be attachedto the lower end. of a drill stem for drilling Another object of theinvention'is to provide a drilling tool, attached to the lower end ofthe drill stem, and equipped with a bit and a reciprocating hammer, saidhammer being actuated against the bit by hydraulic impulses, andwithdrawn therefrom by mechanical means, said bit being therebyactuatedagainst the bottom of the bore to disintegrate theformation thereof.

With the above and other objects in view, the bore to dlsintegrate thesame.

the invention has particular-relation to certain novel. features, ofconstruction, opera- The upper end of the shank is formed intoanenlarged head 12, and threaded onto said shank below the coupling,there is a collar 13, said head and collar being spaced apart asufficient distance to permit a limited reciprocation of the shank andbit. The hammer 5 has an annular rib 14, spaced above the spider 7 andsurrounding said hammer and interposed between said spider and ribthereis a strong coil spring 15.

In operation the device is let down into the bore until the bit rests onthe bottom thereof and the stem is then filled with water, or otherfluid. A force pump, "(not shown) is then connected to the upper end ofthe stem and with each forward stroke thereof, an impulse is transmittedthrough.

said fluid against the upper end of the hammer which is thereby actuatedagainst the head of the shank 10, and the bit is thereby driven againstthe formation at the bottom of I Upon back stroke of the pump, thepressure is released, and the spring 15 will lift the bit out of contionand arrangement of parts, an example tact with the formation preparatoryto anof which is given in this specification and other stroke. he stem,during drilling opillustrated in the accompanying drawings, erations, isslowly turned by any well known the lower on the line 55 of Fig. 1.

wherein:

Figure 1, is a vertical sectional view of art of the device. Y 1

Fig. 2, 1s a vertical sectional view of the. upper part thereof. l Fig.3, is a point view of the bit. 1 Fig. 1, is a transverse sectional viewtaken 85 on the line 4-4: of Fig. 1, and

Fig. 5, is a transverse sectional View taken Referring now moreparticularly to the drawings wherein like numerals of reference 40designate similar parts in each of the figures, the numeral 1, refers toa tubular barrel which is attached to the lower end of the drill stem 2,by means of the collar 3. Within the collar 3, there is a'stufiing box 4through which the cylindrical hammer threaded onto the lowerend ofthebarrel 1.

The lower'end of this coupling 8 has an inwardly extending annularshoulder 9, forming a bearin for the shank 10 of the bit 11. This shanis splined in the bearing so that it will reciprocate therein, but beprevented from turning relative thereto.

form of rotary and the bottom of the bore is thus graduallydisintegrated and bore thus deepened.

In order to wash away the cuttings from the --bit, the entire device iselevated until the bit is lifted clear of the bottom of the bore, thehead 12, then resting on the shoulder 9, and the bit being therebysuspended. The upper end of the hammer has a water conduit 16, extendingdown and diverging out each way forming side ports 17, which are abovethe stuffing box 4:, when the device is in operation, but when the bitis suspended, as above explained, the fluid pressure from' above willforce the hammer downwardly until these orts are in osition,

to discharge water into the barrel 1, eneath the stuffing box 4, and thewater then passes on down through the spider 7, and through the conduit18, through the shank 10 and is discharged onto the blades of the bitand washes away the cuttings thereof and returns, laden with saidcuttings,-up through the bore on the outside of the stem.

What I claim is:

. 1. In a device of the character described, the combination with adrill stem, of a drilling tool attached to the lower end thereof, andincluding a. barrel, a bit formed with a shank which has a bearing inone end of the barrel, a hammer mounted for reciprocation in the barreland adapted to be driven against the'work by fluid impulses, exertedthrough the stem in successive strokes against the shank of the bit, anda yieldable member connected to the hammer and normally operating inopposition to the fluid pressure exerted against said stem.

,2. The combination with a drill stem, of a drilling tool, connected tothe lower end thereof and including a barrel, a hammer therein,yieldable seat whereon the hammer is mounted, a bit formed with a shankwhich is movable lengthwise in a bearing carried by the lower end of thebarrel, said hammer being adapted to be actuated with successive strokesagainst the bit, by fluid impulses exerted through the stem.

resume 3. The combination with a drill stem, of a drilling tool,connected to the lower end thereof, and including a barrel, a hammertherein, a yieldable seat whereon the hammer is mounted, a bit formedwith a shank which is movable lengthwise in a bearing carried by thelower end of the barrel, but

which is keyed against rotation relative thereto, said hammer beingadapted to be actuated with successive strokes againstthe bit, by fluidimpulses exerted through the stem.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

WALTER LEE CHURCH.

Witnesses:

RICHARD LEMLEY,

J. J. DEANE.

